Question: 19. Write a program to check whether the entered number is palindrome or not. 20. Write a number to swap values of C and D

19. Write a program to check whether the entered number is palindrome or not. 20. Write a number to swap values of C and D without using third variable 21. Write a program to find whether the entered number is a prime number number or not. 22. Write a program to find whether the entered number is Armstrong number or not. using C programming

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